Rolex’s new Oyster Perpetual Air-King perpetuates the aeronautical herit age of the original Rolex Oyster. The watch with a 40mm case in 904L steel features a distinctive black dial with a combination of large 3, 6 and 9 numerals marking the hours and a prominent minutes scale for navigational time readings. It is equipped with Calibre 3131, a selfwinding mechanical movement featuring a Perpetual rotor and boasts a power reserve of approximately 48 hours. The oscillator has a blue Parachrom hairspring that offers great stability in the face of temperature variations and remains up to 10 times more precise than a traditional hairspring in case of shocks. It is equipped with a Rolex overcoil, ensuring its regularity in any position.